/Engine/Source/Editor/MaterialEditor/Public/MaterialEditingLibrary.h
Get the current texture parameter value from a Material Instance
static [UTexture](API\Runtime\Engine\Engine\UTexture) * GetMaterialInstanceTextureParameterValue ( [UMaterialInstanceConstant](API\Runtime\Engine\Materials\UMaterialInstanceConstant) * Instance, [FName](API\Runtime\Core\UObject\FName) ParameterName, EMaterialParameterAssociation Association )